K Ball, A MacFarlane, D Crawford, G Savige, N Andrianopoulos and A. Worsley
Health Education Research 24 ( 3 ): 496 - 506 , 2009
R. G Prins, P van Empelen, S. J te Velde, A Timperio, F. J van Lenthe, N. I Tak, D Crawford, J Brug and A. Oenema
Health Education Research 25 ( 3 ): 489 - 497 , 2010